# TX4220

**XDS** · DC-DC Converters · ESOP-8

TX4220 from XDS, in a ESOP-8. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | SW | output | Internal MOSFET drain and switch node, rated 100 V absolute maximum with BVDS of 100 V and RON of 100 mΩ; the exposed thermal pad is also connected to this pin. |
| 2 | VDD | power_in | Chip supply input with an operating range of 5 V to 36 V, undervoltage lockout at 4.8 V on rising VDD, and an absolute maximum of 45 V. |
| 3 | EN | input | Active-high enable input that requires at least 3.2 V for high and at most 0.8 V for low, with an absolute maximum of 45 V. |
| 4 | ROSC | passive | Frequency-setting pin where an external resistor sets the switching frequency, 100 kHz to 330 kHz recommended, about 450 kHz when tied to GND, with an absolute maximum of 6.5 V. |
| 5 | VFB | input | Output voltage feedback input that regulates to 1 V (975 mV to 1025 mV), with an absolute maximum of 6.5 V. |
| 6 | NC | unconnected | No internal connection; leave the pin floating. |
| 7 | GND | power_in | Ground reference pin for the device. |
| 8 | VCS | input | Current-sense input for the MOSFET, where a resistor R_CS sets the peak current limit with a sense threshold of 240 mV to 260 mV and an absolute maximum of 6.5 V. |
| 9 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | XDS |
| Package | ESOP-8 |
| Category | Power Management (PMIC) |
| Pins | 9 |

## CAD (KiCad official)

- Symbol: `TX4220`
- Footprint: `Package_SO:SOIC-8-1EP_3.9x4.9mm_P1.27mm_EP2.41x3.3mm`
- 3D model: ESOP-8 (KiCad packages3D, STEP)
- 3D model files: `tx4220-etched.step` / `tx4220-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `tx4220.step` / `tx4220.glb` are the bare package body.

## Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

- **Datasheet:** [XDS datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8589835257353428992) (7 pp, sha256 `f6129aff7b899f7b`, retrieved 2026-10-09, tier: lcsc)
- **Datasheet language:** Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (text), consensus `claude-sonnet-5-5` (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/tx4220-datasheet.pdf)